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QUICK RUNDOWN OF THE NORMAL BEHAVIOR OF A 700A

Tallest 700A’s I have been on

Arguably, at 20 stories, these have been the tallest Schindler 700A’s I have EVER been on, and the first I’ve been on in a hotel. However, I have noticed some interesting characteristics of the Schindler 700A in mid to high rise applications.

Epic lifts indeed

To start off, these lifts had absolutely incredible acceleration, deceleration and leveling. They take off like rockets and travel at a mindblowing speed of 120 meters per minute, despite serving a travel distance of 55-60 meters. The deceleration is similar to the Schindler 700A’s at the Nordstrom store at the Mall at Short Hills, as it smoothly phases into its full deceleration mode. In terms of character, these lifts do tend to make a little bit of noise and shake on the way up and down the tower. Car 3 makes a very loud screeching noise as it accelerates towards level 17 going down, which I find to make the ride even more fun. These lifts were installed in 1993, which gives them even more 1990’s charm.

Switching direction on intermediate floors

The Schindler 700A does a great job of managing itself on intermediate floors.

At the landing

When exiting the lift on the intermediate floor after selecting a button in the direction opposite of the arrow pointing, it is set to go straight to the floor of the selected button if there are no further calls in the direction the arrow is pointing. However, if you tap the call button for the same direction as the button you pressed inside of the lift, the call from inside the lift will be canceled and you will have to select the same floor again. This is because the computer has not been programmed with algorithms advanced enough to know that the call button has a call in the same direction as the button selected inside of the liftand automatically cancels the car calls in favor of the hall calls. When going in the lift, simply pay attention to the direction the arrow is pointing and re-select your floor.

In the lift car

When in the lift car and the lift is not at the top or bottom floor, the arrow will continue pointing in the same direction upon the car reaching a landing as long as the car is at an intermediate landing. However, if a call is placed by pressing a button for a floor higher than the current floor and the lift is going down (or vice-versa), the arrow will switch direction after the doors have closed. Unless the lifts are placed on up-peak, or down-peak and assuming all variables have been neutralized, the lift’s arrow will change direction and the lift will move up or down to the landing in the same direction as the arrow. This is because the lift uses fairly simple programming to accommodate the most amount of hall and car calls with the least traffic for maximum efficiency using as little programming as possible with a highly advanced reference-tacho point system.

Door problems

It is extremely common, if not normal for a Schindler 700A to exhibit some type of door problem, just like the Schindler 300A. Sensors on 25-30 year old Schindler 700A systems begin to wear out, increasing sensitivity, which leads to more of the phenomenon “door disease”. This ‘door disease’ takes place when the lift is not properly level with the floor, which causes the interlock to miss completely or not fully engaged, causing the lift to either stall a few seconds and then reopen or reopen the doors before they even fully close. If repeated, this could cause a major annoyance and render the single lift inoperable. In some rare, but weird cases, the computer will not know that lift B is perfectly fine and lift A is the one having the door problem, so when a hall call is registered, the computer will assign the call to lift A regardless of lift B’s position in the shaft since lift A is already on your floor, despite being broken. Hence, these lifts need to be modernised or replaced according to the need to fix the door problem to prevent the annoyance experienced by guests or tenants renting/using rooms/offices in the building.

Summary

Throughout this informative post, we have discussed:

  • The Schindler 700A switching directions depending on the nature and criteria of hall and car calls
  • Door problems and the reasons for said door problems on the 700A
  • Why the Schindler 700A is such an epic high rise lift

* Next journal post will be up soon.



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